Valve ________ occurs when both valves are open at the same time at the end of the exhaust stroke and at the beginning of the intake stroke.

Question

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Valve overlap refers to the period in an engine's cycle when both the intake and exhaust valves are open simultaneously. This happens at the end of the exhaust stroke and the beginning of the intake stroke to improve engine breathing.

Valve ________ Occurs When Both Valves Are Open at the Same